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<title>Section 9.12.&nbsp; Summary</title>
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<h3 class="docSection1Title">9.12. Summary</h3>
<p class="docText">This chapter has described the relationships between groups of processes: sessions, which are made up of process groups. Job control is a feature supported by most UNIX systems today, and we've described how it's implemented by a shell that supports job control. The controlling terminal for a process, <tt>/dev/tty</tt>, is also involved in these process relationships.</P>
<p class="docText">We've made numerous references to the signals that are used in all these process relationships. The next chapter continues the discussion of signals, looking at all the UNIX System signals in detail.</P>

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